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A one-step method for separating and recovering selenium and mercury in acid sludge

A technology for separation and recovery of acid sludge, applied in the direction of elemental selenium/tellurium, improvement of process efficiency, binary selenium/tellurium compounds, etc., can solve problems such as complex technical process, difficult separation of selenium and mercury, and achieve safety and controllability High, short mercury separation process, high separation efficiency

Active Publication Date: 2022-07-29
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems in the prior art, such as complex acid mud treatment process and difficult separation of selenium and mercury, the present invention provides a one-step method for separating and recovering selenium and mercury in acid mud, that is, directly separating selenium and mercury in acid mud Roasted as SeO 2 And mercury, mercury is recovered by condensation, selenium dioxide is recovered and refined, and the mercury-containing slag and selenium-containing slag produced in the process are re-refined, so as to realize the efficient and simple treatment of harmful acid sludge

Method used

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  • A one-step method for separating and recovering selenium and mercury in acid sludge
  • A one-step method for separating and recovering selenium and mercury in acid sludge
  • A one-step method for separating and recovering selenium and mercury in acid sludge

Examples

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Effect test

Embodiment 1

[0024] Example 1: One-step method for separating and recovering selenium and mercury in acid sludge (see figure 1 ),Specific steps are as follows:

[0025] (1) Slurry: Mix the acid mud with the slurry liquid and slurried at a temperature of 25°C for 120 min to obtain a slurry; the mass content of mercury in the dried acid mud is 1%, the mass content of selenium is 1%, and the acid mud is 1% by mass. The solid-liquid ratio g:mL to the slurry is 1:6, the slurry contains hydrochloric acid and an oxidant (potassium permanganate), the concentration of hydrochloric acid in the slurry is 20g / L, and the concentration of the oxidant in the slurry is 2g / L;

[0026] (2) Roasting: place the slurry in step (1) at a temperature of 400 °C and microwave roasting for 20 min in an air atmosphere to obtain Hg and SeO 2 Mixed steam and roasting slag, the total content of mercury and selenium in the roasting slag is not more than 1%, and the roasting slag is subjected to pyrometallurgical recov...

Embodiment 2

[0031] Example 2: One-step method for separating and recovering selenium and mercury in acid sludge (see figure 1 ),Specific steps are as follows:

[0032] (1) Slurry: Mix the acid mud with the slurry liquid and slurried at a temperature of 60 °C for 60 minutes to obtain a slurry; the mass content of mercury in the dried acid mud is 43%, the mass content of selenium is 8%, and the mass content of the acid mud is 43%. The solid-liquid ratio g:mL to the slurry is 2:1, the slurry contains sulfuric acid and oxidant (hydrogen peroxide), the concentration of sulfuric acid in the slurry is 90g / L, and the concentration of oxidant in the slurry is 35g / L;

[0033] (2) Roasting: place the slurry in step (1) at a temperature of 600 °C and microwave roasting for 60 min in an air atmosphere to obtain Hg and SeO 2 Mixed steam and roasting slag, the total content of mercury and selenium in the roasting slag is not more than 1%, and the roasting slag is used for pyrometallurgical recovery of ...

Embodiment 3

[0037] Example 3: One-step method for separating and recovering selenium and mercury in acid sludge (see figure 1 ),Specific steps are as follows:

[0038](1) Slurry: mix acid mud and slurry liquid and slurried at 90°C for 100min to obtain a slurry; the mass content of mercury in the dried acid mud is 9%, the mass content of selenium is 71%, and the content of the acid mud is 9%. The solid-liquid ratio g:mL to the slurry is 6:1. The slurry contains nitric acid and an oxidant (hypochlorous acid), the concentration of nitric acid in the slurry is 200g / L, and the concentration of the oxidant in the slurry is 100g / L. L;

[0039] (2) Roasting: place the slurry in step (1) at a temperature of 800 °C and microwave roasting for 120 min in an air atmosphere to obtain Hg and SeO 2 Mixed steam and roasting slag, the total content of mercury and selenium in the roasting slag is not more than 1%, and the roasting slag is used for pyrometallurgical recovery of valuable metals; wherein the...

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Abstract

The invention relates to a one-step method for separating and recovering selenium and mercury in acid sludge, and belongs to the technical field of acid sludge treatment. In the present invention, acid mud and slurry are mixed and slurried for 30 to 120 minutes to obtain slurry; wherein the slurry contains acid and oxidant; SeO 2 The mixed steam and roasting slag, the roasting slag is used for valuable metal recovery; Hg and SeO 2 The mixed vapor condenses to separate out SeO 2 Crude steam and Hg element; SeO 2 The crude steam is passed into the absorption tower for hydrolysis to obtain H 2 SeO 3 , access SO 2 Flue gas reduction of H 2 SeO 3 The crude selenium is obtained, and the crude selenium is dried and refined to obtain refined selenium. The present invention directly roasts the selenium and mercury in the acid mud into SeO 2 and mercury, mercury is recovered by condensation, selenium dioxide is reduced, recovered and refined, and the mercury-containing slag and selenium-containing slag produced in the process are re-refined, so as to achieve efficient and simple treatment of harmful acid sludge.

Description

technical field [0001] The invention relates to a one-step method for separating and recovering selenium and mercury in acid sludge, and belongs to the technical field of acid sludge treatment. Background technique [0002] The treatment of mercury and selenium pollution has become one of the major concerns in the field of global environmental science and technology. The advanced treatment of valuable smelting resources containing mercury and selenium has become a challenge in the field of mercury pollution control. Research and development to efficiently remove mercury and selenium from valuable smelting resources has become an urgent need to ensure the safety of the ecological environment. [0003] The method for separating selenium, mercury and lead from acid mud by chlorination leaching in the prior art is to add sodium chlorate to oxidize and leaching mercury and selenium, and then feed SO 2 Reducing crude selenium and adding sodium sulfide to precipitate mercury can c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/02C22B43/00C01B19/02C01B19/04
CPCC22B7/004C22B7/007C22B1/02C22B43/00C01B19/02C01B19/004Y02P10/20
Inventor 张利波杨坤洪岩潘锡剑
Owner KUNMING UNIV OF SCI & TECH
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